diff --git a/content/docs-lite/en/docs/BriefTutorial/functions.md b/content/docs-lite/en/docs/BriefTutorial/functions.md
index 72f89e71e0986cd12effb90b6755599fbcb96a1b..1064c490a00026b693ebc36b559f44c9079a0f27 100644
--- a/content/docs-lite/en/docs/BriefTutorial/functions.md
+++ b/content/docs-lite/en/docs/BriefTutorial/functions.md
@@ -1099,10 +1099,21 @@ The common functions of openGauss are as follows:
     ```
 
 
--   to\_number\(text, text\)
+-   to\_number \( expr \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     Description: Converts the values of the string type into the numbers in the specified format.
 
+    expr can be any expression that evaluates to a character string of type CHAR, VARCHAR2, NCHAR, or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT,
+    or BINARY_DOUBLE, or null.
+    1. If expr is NUMBER, then the function returns expr.
+    2. If expr evaluates to null, then the function returns null.
+    3. Otherwise, the function converts expr to a NUMBER value.
+
+    DEFAULT return_value ON CONVERSION ERROR is optional. Allows you to specify the value to be returned when a conversion error occurs.
+    Return_value can be an expression or a binding variable, and must be evaluated as a character string of type CHAR、VARCHAR2、NCHAR or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT or BINARY_DOUBLE, or null.
+
+    fmt is optional. Format string.
+
     Return type: numeric
 
     Example:
diff --git a/content/docs-lite/en/docs/BriefTutorial/type-conversion-functions.md b/content/docs-lite/en/docs/BriefTutorial/type-conversion-functions.md
index b0bfb3b276b7ac2dbe17159718046a5818cb599d..d9c06889983c2e5734ce19f810c3966cb204c454 100644
--- a/content/docs-lite/en/docs/BriefTutorial/type-conversion-functions.md
+++ b/content/docs-lite/en/docs/BriefTutorial/type-conversion-functions.md
@@ -380,10 +380,21 @@
     (1 row)
     ```
 
--   to\_number \( expr \[, fmt\]\)
+-   to\_number \( expr \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     Description: Converts  **expr**  into a value of the NUMBER type according to the specified format.
 
+    expr can be any expression that evaluates to a character string of type CHAR, VARCHAR2, NCHAR, or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT,
+    or BINARY_DOUBLE, or null.
+    1. If expr is NUMBER, then the function returns expr.
+    2. If expr evaluates to null, then the function returns null.
+    3. Otherwise, the function converts expr to a NUMBER value.
+
+    DEFAULT return_value ON CONVERSION ERROR is optional. Allows you to specify the value to be returned when a conversion error occurs.
+    Return_value can be an expression or a binding variable, and must be evaluated as a character string of type CHAR、VARCHAR2、NCHAR or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT or BINARY_DOUBLE, or null.
+
+    fmt is optional. Format string.
+
     For details about the type conversion formats, see  [Table 1](#en-us_topic_0283137417_en-us_topic_0237121973_en-us_topic_0059778246_t3987a5bb00154b0f9e55863b4ababd3d).
 
     If a hexadecimal string is converted into a decimal number, the hexadecimal string can include a maximum of 16 bytes if it is to be converted into a sign-free number.
diff --git a/content/docs-lite/en/docs/SQLReference/type-conversion-functions.md b/content/docs-lite/en/docs/SQLReference/type-conversion-functions.md
index 32240d5911263bb599be370af0a0d49a250ad019..c8c9a965941386de991f7d67a3b1d7bc5b7a5fb0 100644
--- a/content/docs-lite/en/docs/SQLReference/type-conversion-functions.md
+++ b/content/docs-lite/en/docs/SQLReference/type-conversion-functions.md
@@ -397,10 +397,21 @@
     (1 row)
     ```
 
--   to\_number \( expr \[, fmt\]\)
+-   to\_number \( expr \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     Description: Converts  **expr**  into a value of the NUMBER type according to the specified format.
 
+    expr can be any expression that evaluates to a character string of type CHAR, VARCHAR2, NCHAR, or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT,
+    or BINARY_DOUBLE, or null.
+    1. If expr is NUMBER, then the function returns expr.
+    2. If expr evaluates to null, then the function returns null.
+    3. Otherwise, the function converts expr to a NUMBER value.
+
+    DEFAULT return_value ON CONVERSION ERROR is optional. Allows you to specify the value to be returned when a conversion error occurs.
+    Return_value can be an expression or a binding variable, and must be evaluated as a character string of type CHAR、VARCHAR2、NCHAR or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT or BINARY_DOUBLE, or null.
+
+    fmt is optional. Format string.
+
     For details about the type conversion formats, see  [Table 1](#en-us_topic_0283137417_en-us_topic_0237121973_en-us_topic_0059778246_t3987a5bb00154b0f9e55863b4ababd3d).
 
     If a hexadecimal string is converted into a decimal number, the hexadecimal string can include a maximum of 16 bytes if it is to be converted into a sign-free number.
diff --git "a/content/docs-lite/zh/docs/BriefTutorial/\345\207\275\346\225\260.md" "b/content/docs-lite/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
index a23e9c22073e58a09c45c030133a536c26372410..ad2530d045af8695fef37baab71a83e586de28dc 100644
--- "a/content/docs-lite/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
+++ "b/content/docs-lite/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
@@ -1099,10 +1099,15 @@ openGauss常用的函数如下：
     ```
 
 
--   to\_number\(text, text\)
+-   to\_number \( text \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     描述：将字符串类型的值转换为指定格式的数字。
 
+    DEFAULT return_value ON CONVERSION ERROR 可选的。允许指定在转换发生错误时返回的值。
+    return_value 可以是表达式或绑定变量，并且必须计算为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值或 null。
+
+    fmt 可选的。格式化字符串。
+
     返回值类型：numeric
 
     示例：
diff --git "a/content/docs-lite/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md" "b/content/docs-lite/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
index 80905157d08831131a1021500794d82ac5de9a59..96b578d4d292a2e85d546d9114662f7d507c8047 100644
--- "a/content/docs-lite/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
+++ "b/content/docs-lite/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
@@ -397,10 +397,16 @@
     (1 row)
     ```
 
--   to\_number \( expr \[, fmt\]\)
+-   to\_number \( expr \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     描述：将expr按指定格式转换为一个NUMBER类型的值。
 
+    1. expr 输入为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、 BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值，或 null。
+
+    2. DEFAULT return_value ON CONVERSION ERROR 可选的。允许指定在转换发生错误时返回的值。
+        * return_value 可以是表达式或绑定变量，并且必须计算为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值或 null。
+    3. fmt 可选的。格式化字符串。
+
     类型转换格式请参考[表1](#zh-cn_topic_0283137417_zh-cn_topic_0237121973_zh-cn_topic_0059778246_t3987a5bb00154b0f9e55863b4ababd3d)。
 
     转换十六进制字符串为十进制数字时，最多支持16个字节的十六进制字符串转换为无符号数。
diff --git a/content/en/docs/BriefTutorial/functions.md b/content/en/docs/BriefTutorial/functions.md
index ced9f5622b47f9f2e526fba4d6a1a94b24a21b97..a3bcec81306d65ef00e38a6a2710e625bc0d0a8b 100644
--- a/content/en/docs/BriefTutorial/functions.md
+++ b/content/en/docs/BriefTutorial/functions.md
@@ -1099,10 +1099,15 @@ The common functions of openGauss are as follows:
     ```
 
 
--   to\_number\(text, text\)
+-   to\_number \( text \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     Description: Converts the values of the string type into the numbers in the specified format.
 
+    DEFAULT return_value ON CONVERSION ERROR is optional. Allows you to specify the value to be returned when a conversion error occurs.
+    Return_value can be an expression or a binding variable, and must be evaluated as a character string of type CHAR、VARCHAR2、NCHAR or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT or BINARY_DOUBLE, or null.
+
+    fmt is optional. Format string.
+
     Return type: numeric
 
     Example:
diff --git "a/content/zh/docs/BriefTutorial/\345\207\275\346\225\260.md" "b/content/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
index ebc297f8b49bf9bc66a3123d6fc5e7939a95285f..3e1fa87d6190edda21abeda78cbfdd2f6ac1d1f5 100644
--- "a/content/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
+++ "b/content/zh/docs/BriefTutorial/\345\207\275\346\225\260.md"
@@ -1099,9 +1099,15 @@ openGauss常用的函数如下：
     ```
 
 
--   to\_number\(text, text\)
+-   to\_number \( text \[ DEFAULT return_value ON CONVERSION ERROR \] \[, text\]\)
 
-    描述：将字符串类型的值转换为指定格式的数字。
+    描述：将expr按指定格式转换为一个NUMBER类型的值。
+
+    1. expr 输入为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、 BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值，或 null。
+
+    2. DEFAULT return_value ON CONVERSION ERROR 可选的。允许指定在转换发生错误时返回的值。
+        * return_value 可以是表达式或绑定变量，并且必须计算为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值或 null。
+    3. fmt 可选的。格式化字符串。
 
     返回值类型：numeric
 
diff --git "a/content/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md" "b/content/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
index 7d6572853f343e2f2c2cb29f8c02b5180418dede..63aaf311e3103521b7af26e8d912c8f1fd2835fb 100644
--- "a/content/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
+++ "b/content/zh/docs/SQLReference/\347\261\273\345\236\213\350\275\254\346\215\242\345\207\275\346\225\260.md"
@@ -398,10 +398,16 @@
     (1 row)
     ```
 
--   to\_number \( expr \[, fmt\]\)
+-   to\_number \( expr \[ DEFAULT return_value ON CONVERSION ERROR \] \[, fmt\]\)
 
     描述：将expr按指定格式转换为一个NUMBER类型的值。
 
+    1. expr 输入为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、 BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值，或 null。
+
+    2. DEFAULT return_value ON CONVERSION ERROR 可选的。允许指定在转换发生错误时返回的值。
+       * return_value 可以是表达式或绑定变量，并且必须计算为 CHAR、VARCHAR2、NCHAR 或 NVARCHAR2 类型的字符字符串、NUMBER、BINARY_FLOAT 或 BINARY_DOUBLE 类型的数值或 null。
+    3. fmt 可选的。格式化字符串。
+
     类型转换格式请参考[表1](#zh-cn_topic_0283137417_zh-cn_topic_0237121973_zh-cn_topic_0059778246_t3987a5bb00154b0f9e55863b4ababd3d)。
 
     转换十六进制字符串为十进制数字时，最多支持16个字节的十六进制字符串转换为无符号数。